﻿66 
  KEY 
  AND 
  FLORA 
  

  

  4-cleft 
  calyx, 
  4 
  stamens, 
  and 
  a 
  rudimentary 
  ovary 
  ; 
  pistil- 
  

   late 
  flowers 
  in 
  capitate 
  clusters, 
  calyx 
  3-4-toothed. 
  Ovary 
  

   stalked 
  ; 
  style 
  2-cleft. 
  Fruit 
  in 
  a 
  globular 
  head.* 
  

  

  1. 
  B. 
  papyrifera 
  Vent. 
  PAPER 
  MULBERRY. 
  A 
  round-topped 
  tree 
  

   with 
  yellowish-brown 
  bark. 
  Leaves 
  cordate, 
  often 
  irregularly 
  2-3- 
  

   lobed, 
  serrate, 
  rough 
  above, 
  downy 
  beneath, 
  long-petioled. 
  Stamiuate 
  

   spikelets 
  peduncled, 
  2-3 
  in. 
  long. 
  Pistillate 
  heads 
  stout, 
  peduncled, 
  

   about 
  1 
  in. 
  in 
  diameter. 
  Introduced 
  from 
  Asia 
  and 
  very 
  common 
  S. 
  

   about 
  old 
  dooryards.* 
  

  

  IV. 
  CANNABIS 
  L. 
  

  

  Coarse 
  herbs 
  with 
  very 
  tough, 
  fibrous 
  bark. 
  Leaves 
  usu- 
  

   ally 
  opposite, 
  palmately 
  compound. 
  Flowers 
  small, 
  dioecious, 
  

   greenish, 
  the 
  staminate 
  ones 
  in 
  compound 
  racemes 
  or 
  panicles, 
  

   the 
  pistillate 
  ones 
  in 
  spikes. 
  Calyx 
  of 
  the 
  staminate 
  flowers 
  of 
  

   5 
  sepals, 
  that 
  of 
  the 
  pistillate 
  flowers 
  of 
  1 
  large 
  sepal 
  which 
  

   covers 
  the 
  ovary 
  and 
  the 
  akene. 
  

  

  1. 
  C. 
  sativa 
  L. 
  COMMON 
  HEMP. 
  An 
  erect 
  plant, 
  4-8 
  ft. 
  high. 
  

   Leaves 
  large, 
  petioled, 
  of 
  5-7 
  lanceolate, 
  irregularly 
  serrate 
  or 
  toothed 
  

   leaflets. 
  Cultivated 
  from 
  Europe, 
  S. 
  and 
  W., 
  for 
  its 
  fiber, 
  and 
  some- 
  

   times 
  runs 
  wild 
  along 
  roadsides 
  in 
  rich 
  soil. 
  

  

  21. 
  URTICACE^E. 
  NETTLE 
  FAMILY 
  

  

  Herbs 
  with 
  watery 
  juice, 
  stem 
  and 
  leaves 
  often 
  clothed 
  with 
  

   stinging 
  hairs. 
  Leaves 
  undivided, 
  stipulate. 
  Flowers 
  small, 
  

   greenish, 
  unisexual, 
  apetalous 
  in 
  axillary 
  clusters. 
  Calyx 
  of 
  

   the 
  staminate 
  flowers 
  4-5-parted 
  or 
  4-5-sepalous 
  ; 
  stamens 
  as 
  

   many 
  as 
  the 
  sepals 
  and 
  opposite 
  them 
  ; 
  filaments 
  inflexed 
  in 
  

   the 
  bud 
  and 
  straightening 
  at 
  maturity 
  ; 
  anthers 
  2-celled. 
  Calyx 
  

   of 
  pistillate 
  flowers 
  2-4-sepalous 
  ; 
  ovary 
  sessile, 
  1-celled 
  ; 
  

   stigma 
  simple 
  or 
  tufted. 
  Fruit 
  an 
  akene 
  commonly 
  inclosed 
  

   in 
  the 
  dry, 
  persistent 
  calyx.* 
  

  

  URTICA 
  L. 
  

  

  Annual 
  or 
  perennial 
  herbs. 
  Leaves 
  with 
  stinging 
  hairs, 
  

   opposite, 
  petioled, 
  several-nerved, 
  dentate 
  or 
  incised, 
  stipulate. 
  

   Flowers 
  monoecious 
  or 
  dioscious. 
  Calyx 
  of 
  the 
  staminate 
  

  

  